docs: Patreon button + Supporters page

docs/supporters.rst

@@ -0,0 +1,27 @@
+.. include:: global.rst.inc
+
+.. _supporters:
+
+|Donate via Patreon| |Donate via Liberapay| |Donate via PayPal|
+
+zrepl is a spare-time project primarily developed by `Christian Schwarz <https://cschwarz.com>`_.
+You can support maintenance and feature development through one of the services listed above.
+
+**Thanks for your support!**
+
+.. NOTE ::
+
+   PayPal takes a relatively high fixed processing fee plus percentage of the donation.
+   Larger less-frequent donations make more sense there.
+
+Supporters
+==========
+
+We would like to thank the following people / organizations for supporting zrepl through monetary and other means:
+
+* `Ross Williams <https://github.com/overhacked>`_
+* Mike T.
+* `Justin Scholz <https://github.com/JMoVS>`_
+* `InsanePrawn <https://github.com/InsanePrawn>`_
+* `Ben Woods <https://www.freshports.org/sysutils/zrepl/>`_
+* `Anton Schirg <https://github.com/antonxy>`_